The issue is related to a Server-Side Request Forgery (SSRF) vulnerability in the `getUpgradePath($url)` function, located in `plugins/action.updater/UpgradeManager.php`. This vulnerability can be exploited by an authenticated admin user who enters a URL into the Upgrade Engine and then reloads the page or presses "Check Now", allowing the attacker to request arbitrary URLs and pivot requests through the server.